a Public transportation refers to bus, streetcar, subway, or
elevated trains.

b Other means include ferryboats, surface trains, and van
service.

NOTES

Principal
means of transportation refers to the mode used most often, when different
means of transportation were used on different days of the week, or the mode
used for the longest distance during the trip to work, when more than one
mode is used to get to work each day.

Numbers may not add to totals due to rounding.

SOURCE

U.S. Department of Housing and Urban Development, American Housing Survey for the United States: 2005 (Washington, DC: 2006), table 2-24 and similar tables in
earlier editions, Internet site http://www.census.gov/hhes/www/ahs.html as of
Oct. 12, 2006.